{"title":"Fluorostar","description":"","products":[{"product_id":"william-optics-fluorostar-91-apo-red","title":"William Optics Fluorostar 91 APO - Red","description":"\u003cp\u003eThe \u003cstrong\u003eWilliam Optics Fluorostar 91 APO\u003c\/strong\u003e is a premium 91mm f\/5.9 triplet apochromatic refractor designed for visual astronomy, portable observing, and high-quality deep-sky astrophotography. With its 540mm focal length, triplet optical design, and compact premium build, the FLT 91 is a strong choice for customers who want a serious refractor that remains manageable for backyard and portable use.\u003c\/p\u003e\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\u003cp\u003eThe Fluorostar 91 is best for intermediate and advanced observers or astrophotographers who want a higher-performance triplet refractor than a compact entry-level APO. It is suitable for visual observing, lunar and planetary viewing, wide-field deep-sky imaging, and customers building a premium portable imaging setup.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e91mm triplet APO optics:\u003c\/strong\u003e Delivers excellent colour correction and sharp image quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/5.9 focal ratio:\u003c\/strong\u003e A versatile balance for visual use and astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e540mm focal length:\u003c\/strong\u003e Useful for nebulae, star fields, larger galaxies, lunar observing, and general refractor use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortable premium refractor:\u003c\/strong\u003e More capable than smaller travel scopes while still manageable on many mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging upgrade path:\u003c\/strong\u003e Pairs with compatible William Optics flatteners\/reducers for camera use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVisual astronomy\u003c\/li\u003e\n\u003cli\u003eWide-field and mid-field astrophotography\u003c\/li\u003e\n\u003cli\u003eLunar and planetary observing\u003c\/li\u003e\n\u003cli\u003ePremium portable refractor setups\u003c\/li\u003e\n\u003cli\u003eDeep-sky imaging with compatible flattener\/reducer\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eFor astrophotography, customers should pair the Fluorostar 91 with the appropriate William Optics flattener or reducer and confirm camera spacing, adapters, filter wheel clearance, focuser support, and mount capacity. For visual observing, use compatible diagonals and eyepieces.\u003c\/p\u003e\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\u003cp\u003eThe Fluorostar 91 is more capable than compact travel refractors but still has a shorter focal length than dedicated planetary or small-galaxy telescopes. For best full-frame astrophotography performance, a matched field flattener or reducer is recommended.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eIs the Fluorostar 91 good for beginners?\u003c\/h3\u003e\u003cp\u003eIt can be used by a beginner, but it is best for customers who want a premium refractor and are prepared to invest in a suitable mount and accessories.\u003c\/p\u003e\u003ch3\u003eCan it be used visually?\u003c\/h3\u003e\u003cp\u003eYes. The Fluorostar 91 can be used for visual observing with compatible diagonals and eyepieces.\u003c\/p\u003e\u003ch3\u003eCan it be used for astrophotography?\u003c\/h3\u003e\u003cp\u003eYes. It is well suited to astrophotography when paired with the appropriate flattener or reducer and a suitable tracking mount.\u003c\/p\u003e\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\u003cp\u003eThe William Optics Fluorostar 91 APO is a strong choice for customers who want a premium portable triplet refractor for both observing and imaging. Choose it if you want better optical performance and more reach than a smaller travel scope while keeping the system manageable.\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Yes \/ Yes \/ Yes","offer_id":44013639336047,"sku":"T-FLT-91RD-RP33","price":2609.99,"currency_code":"CAD","in_stock":true},{"title":"Yes \/ Yes \/ No","offer_id":44013639368815,"sku":"T-FLT-91RD-RP33","price":2564.99,"currency_code":"CAD","in_stock":true},{"title":"Yes \/ No \/ Yes","offer_id":44013639401583,"sku":"T-FLT-91RD-RP33","price":2574.99,"currency_code":"CAD","in_stock":true},{"title":"Yes \/ No \/ No","offer_id":44013639434351,"sku":"T-FLT-91RD-RP33","price":2529.99,"currency_code":"CAD","in_stock":true},{"title":"No \/ Yes \/ Yes","offer_id":44013639467119,"sku":"T-FLT-91RD-RP33","price":2574.99,"currency_code":"CAD","in_stock":true},{"title":"No \/ Yes \/ No","offer_id":44013639499887,"sku":"T-FLT-91RD-RP33","price":2529.99,"currency_code":"CAD","in_stock":true},{"title":"No \/ No \/ Yes","offer_id":44013639532655,"sku":"T-FLT-91RD-RP33","price":2539.99,"currency_code":"CAD","in_stock":true},{"title":"No \/ No \/ No","offer_id":44013639565423,"sku":"T-FLT-91RD-RP33","price":2494.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/hero__94626.jpg?v=1766558253"},{"product_id":"william-optics-flat6aiii-special-edition-for-fluorostar-91","title":"William Optics FLAT6AIII special edition for Fluorostar 91","description":"\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003eAdjust the distance for DSLR and mirrorless camera with the William Optics FLAT6AIII.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003eSpecifications\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFull frame size\u003c\/li\u003e\n\u003cli\u003eDesigned with nearly Full frame chip-size DSLR cameras in mind\u003c\/li\u003e\n\u003cli\u003eFMC triplet APO design\u003c\/li\u003e\n\u003cli\u003eProduced entirely with the best Ohara optical glasses\u003c\/li\u003e\n\u003cli\u003eReducing factor 0.8X\u003c\/li\u003e\n\u003cli\u003eAdjustable design, for perfect back focus it can be used with other models of refractor\u003c\/li\u003e\n\u003cli\u003e48mm filter ready\u003c\/li\u003e\n\u003cli\u003eSuperb Finish\u003c\/li\u003e\n\u003cli\u003eWilliam Optics polished anodized finish\u003c\/li\u003e\n\u003cli\u003eAll internal surfaces threaded and blackened to prevent reflections\u003c\/li\u003e\n\u003cli\u003eEasy to Use\u003c\/li\u003e\n\u003cli\u003eWill accept any standard 48mm T-ring for your camera\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 1.8; color: rgb(64, 64, 64); font-family: \" pt sans sans-serif justify rgb font-size:=\"\" text-align:=\"\" background-color:=\"\"\u003e\u003cbr style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased;\"\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44013645594735,"sku":"P-FLAT6AIII-M92","price":339.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/flat6aiii__35834.jpg?v=1766558494"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/collections\/api66603o__47396.jpg?v=1767587909","url":"https:\/\/ontariotelescope.com\/collections\/fluorostar.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}